package demo3;

import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;

class Node {
    public int val;
    public Node next;
    public Node random;

    public Node(int val) {
        this.val = val;
    }
}


public class Test {
    public static void main(String[] args) {



    }
    public Node copyRandomList(Node head) {
        Map<Node,Node> map = new HashMap<>();
        Node cur = head;
        while (cur != null) {
            map.put(cur,new Node(cur.val));
            cur = cur.next;
        }
        cur = head;
        while (cur != null) {
            map.get(cur).next = map.get(cur.next);
            map.get(cur).random = map.get(cur.random);
            cur = cur.next;
        }
        return map.get(head);
    }
}
